1. The Idea -- use a standard electric sprinkler valve and garden hose adapters to control the flow of water using a parallel port based C program in Linux. Scheduling accomplished by running a cronjob.
2. The Parts-- Gather the parts.
3. Build the Electronics -- Assemble the parts.
4. Plumbing-- Use the Thread Tape
5. Software -- Install linux compile some software and create a yard fountain. (see below)
6. Scheduling -- sudo Crontab -e
7. Other Notes-- more thoughts on the project.
Step 1: The Idea...
The plan is to use a standard electric sprinkler valve two garden hose adapters a relay and old 12v power supply to control the flow of water from and old linux computer. This will allow the fine tuning of watering time using cronjobs.
Step 2: The Parts...
1. A garden or other area that needs water on a regular basis.
2. A garden hose
3. A electric sprinkler vavle
4. 2x PVC to Garden hose adapter for the size valve you are using.
5. Old Laptop Power supply or other "Wall Wart" power brick with suitable voltage for your valve.
6. One 5v Relay ( radio shack )
7. One Diode ( radio shack )
8. One Male DB 25 connector ( radio shack)
9. Some Wire.
10. Tape, Electrical Tape and Plumbers Thread tape
11. PCB blank ( I used some scraps from other projects)
13 PCB enchant.
14. Old computer ( I used a Pentium III box ) just make sure it has the standard LPT printer port for the DB 25 connector.